Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a881192172eb01521f7ff3bcaab659905fa5f71b188a6bbb2058d8b0ee6b4928' 
  AND token = '9gH2N7amQFXGE1rhzBo48SZbfxmi+5mhUOHoaKsuLbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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