Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29195569fa48b4c808ca0eb25dcee48b5e3c50e0b7ecfd84c8a0cf15953def3c' 
  AND token = 'H3zbLAxCVZnGGBqP9oQAovbEqCsZgKyaYlOU8Zqf8Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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