Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab104b8a13f77c29f2576ebd5ca4a750f5aec40092d2d2462a49caea754c522' 
  AND token = 'fK+dheQk35q2psOQ/xnGOuPJ7v7yyBtTz/H7mv21EJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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