Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c2283b1931b1eb291e261b503aaa8668003f4eaef8bccde59b3fe8a6d8ed6d' 
  AND token = 'HJL9rk+au1qbW9ern8p/hZDVuVJ9MWAc69UkNRYN7Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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