64 degrees is pretty cold for most wine yeast (if you used wine yeast). Bring a few of the bottles upstairs, and put them someplace warm (like on top of the fridge). Wine yeast can be very warm- like 80 degrees- and be happy. That should help get them carbed up. That's really light on the priming sugar, but you should have a little carbonation.
Broken Leg Brewery
Giving beer a leg to stand on since 2006