This takes about 10s to win once in game.
Create a new 2 player quick match
Use these Game Settings
Non-standard settings are Bold (in game they will show as green). NB: sometimes there are multiple standard/black options.
*** Spoiler - click to reveal ***Teams & Allies: Survival of the Fittest
Map Style: Great Sahara
Map Size: Any
Game Speed: Normal
Cannon Time: None
Game Rules: Custom
Start With: Small Town
Resources: Infinite
Technology: Normal and Slow
Reveal Map: All Visible
Population: 200
Rush Rules: Standard
Start Age: Ancient Age
End Age: Information Age
Elimination: Sudden Death
Victory: Sudden Death
Wonder Victory: 8 Wonder Points
Territory Goal: 70% of World Territory
Everything below unchecked except "Save to Profile"
Players
You as Greeks
computer player (Any difficulty) as Aztecs (but it doesn't really matter)
You just need to capture one of their cities.
Immediately research Science 1 followed by military 1, then classical age.
Build 2-4 stables. While they build queue up research for military, science, civics, commerce (in that order).
Start them producing infinite unique greek horse units (Companion). You can select all the stables with Shift-S and then hit HQ which will add a companion and tell it to produce infinitely.
You can also right click somewhere on the map with the stables selected and they will go there after being built. If the enemy has started their 2nd city, right click on it and they will go there and start attacking. If they haven't started it, you can either send them at the main city or just to the enemies side of the map and direct them to the city after they get there. Shift+comma will select all your military units.
You can upgrade to medieval age and upgrade to royal companions as well if you want.