Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6e62996e5e3fc958a89c1bbfb2c3699bcfa3c00f06196965c86085f7592e13' 
  AND token = 'JCVhF9jN5Pj+1XOUfFNEitK4aaEdfrR8Od+1WBnJynA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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