Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a694111f9e863ff0d3bdb5d3c22f711014fb299d41f21ac26d90e3b495bf042' 
  AND token = 'q0WKiq6zXgWRUXiiPvPld7SxIRIzL/tYCsnMYi1TFqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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