As others said, need to know at least villain read and stack sizes.
A donk pot sized bet is usually not very strong. 85 would be the most likely hand that he has that could beat you AND play this way. I could see him having a weaker K and donk betting like that, but you have this hand beat.
By the turn, add KT to the short list of hands he could have that could beat you.
Of course, if villain is a guy who just comes out firing when he has a big hand, then fold.
So if it's me, I'd really need to have some type of read on villain's style of play to decide whether to call or muck.
Wouldn't shock me if he had 67.