Yeah, i think it is more like thousands of years. wiki origin of species (Darwin)

". . .. plant breeding, going back to ancient egypt"

But breeding and GMO are different tech entirely, even if they might have similar results.

Breeding plants probably started before egypt (they just the earliest with decipherable writing ) even just as an unintended biproduct of agriculture, just planting stuff together then weeding out the plants with less desirable yield, or selecting seed from the most productive plants for next year would do it. t may not hve been conscious or scientific, but it would have been effective over the generations.