Insta-muck. - It's rush poker, insta-everything.
I don't think you're dominated by his range, I've only played 1.6k hands of rush but the people buying in short were doing all sorts of freaky things. But commiting 60bb pre-flop with JJ isn't good, I think you're about even money against his range (guessing 99+/AK).
It's shove or fold (to avoid high card flops, where he can shove and you lose your equity against smaller pairs), and it's a close enough decision that I'd fold and move on to the next hand.
I was actually raising JJ or if someone raised before me I was calling to set mine/play an overpair if they showed weakness. Definately not 3betting or calling 3bets unless I had odds
, maybe I just suck at rush poker but that's my appraoch.