Depending on how late you are going to be you could grab something at the food court at MCO. If it is going to be late then I would get something from the food court at the airport you are in now.
1) You can order from
. . . three different off-site pizza delivery companies
. . . one off-site Chinese delivery company
. . . one off-site BBQ company
2) The Front Desk has a list.
Sorry about your flight.
I just looked up the delivery times in my Passporter, it is from 4:00pm to midnight. So you should be good with delivery times. Also the food court is open till midnight according to my Passporter. Good Luck with your flight and dinner!!