Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c68068f16271f5671872fec164b0f80dee7ebda78fdb549b93408360f198e4' 
  AND token = 'w5+DtQpgPR2ub5i1fPD552hDYp2VanIav7IAjIvuoU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}