First of all... if its that dry DO NOT DROP A MATCH.... ya might not be able to control or contain it once it get going.
If it was a mixture then there may be some hope if ya get some rain. What was underneath what you looked? Any green at all? You still could have residual seed from last year and you may just be experiencing a thing called estivation (a kind of hibernation for plants during rough weather) Of course, again depending on the seed, it could be all over. I would think if the seed co advertised five years they were looking at a long term clover, forbes and grasses mix.
Give it a bit with some rain and see what ya get. If nothing shows up you can always chop it and plant after fly free time with a good mixture.
This is not an unuaual experience with some food plot mixtures. You might be better off however, consulting your private lands Biologist about a good mix. The "Package" big name stuff is overpriced and often not designed for "your" area. I see this frequently in my consulting work.