If Seal Away leaves the battlefield before its triggered ability resolves, the target creature wonâ€™t be exiled.
If a token is exiled this way, it will cease to exist and wonâ€™t return to the battlefield.
Auras attached to the exiled creature will be put into their ownersâ€™ graveyards. Any Equipment will become unattached and remain on the battlefield. Any counters on the exiled creature will cease to exist. When the card returns to the battlefield, it will be a new object with no connection to the card that was exiled.