Hi Bubu,
can you think about a period in human history when there were no machines? It really depends on what you intend by "machines", but if you intend them as technologies then we have always used them, in any moment of our history. Language itself can be understood as a technology.
Also, pay attention to what McLuhan says when he describes media. He has a very specific definition of media which is not limited to what we might intend today with "the (mass) media" (TV, radio, newspapers, etc.), and definitely not just airplanes and robots. Media are extensions of our faculties. As such, McLuhan intends roads, coins, clothes, numbers, houses, written words, clocks and many other things as media.
When he says we are "servomechanisms" of media he does not mean that we are becoming slaves, but that we have always been narcotised (as was Narcissus - in McLuhan's reading of the myth) by our own extensions.