If there was a 1st moment in time.

[pocaracas]

If there is a first moment in time,  it didn't always exist.

You want to have your mind blown?

If a photon was produced at that hypothetical first moment in time and if would travel through empty space without hitting anything, from the point of view of that photon, no time will have elapsed.... until now.... until whenever.

From that photon's point of view (if such a wording can be used), that first instant of time is the single one that has always existed.

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Don't make judgments about time, space, space-time and the like, concerning extreme circumstances, when you're drawing upon your simple local experience of those things.

Empty space-time (what Krauss calls "nothing") can bring forth energy and particles. Extrapolating the concept... space-time might be able to bring forth Universes.