A simple Ultimate Jackal rush in a Coop game will do this every time.. I recommend several Ultimate's to make it go faster, but they shouldn't be mandatory. Basically, spam Ultimate Jackals or your best cheap vehicle unit from the start, using
to target them on the enemy base, and try to get ~30 of them as fast as you can. Help them out with your AirMech by shooting down the enemy AirMech's if you can, and the match should finish extremely fast, in under a minute.