Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0421a5bc48c6e61b3d19fb144b9879f21d61dbde3db59b2438603fd0b0eaf9d' 
  AND token = '4B5VSlNIwuMri4aV4mZbBZfyNWF3nHcJcjFuqYIoA98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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