Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a3dfd7baa1b2207914677827d8a60243bfe9e63bfaa977d915268434988fff' 
  AND token = 'oNcG8cURyPzR7/Hfu9yLQtbs3CsYJhOHdn2EJa5BiM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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