When you enter terminal 3 (CVG), head right. They're near the end of the row of check in counters. Not sure about food, not much of a selection at that hour but MAYBE McDonald's at that hour after going through security. There's also a Starbucks you can enter prior to going through security...you go up one level from the check in counters and it's just ahead and right of the escalator. As far as food, no meals are served...only food for purchase in the form of snacks and drinks. Frontier's website offers a link to their menu. Prices are a bit high, but I'd say on par with airport prices.