Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc26acc49c8c0187b057007b8c28d0f4a58f46bae03727bbda791be9bf261e66' 
  AND token = 'Fkpde/nJ5t+ezhntF5ZevklIOy30ESknKRrJmF/nElA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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