Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '152e1ff32703ff60abb4e6229f4c6c785e293f2fc30593820622dc471ac3b447' 
  AND token = 'Oi4xfV8dAwBxhT+Dy+Urfp07TVxM9UhCvlsL9QVmxKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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