Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77654ebdceaed258f135b4c73ec8b59181ddfec069a93c193fb47edb3af47dc7' 
  AND token = '+f+Ldc/jkFiBsHBGbCzFFYj3L4h2tM77WXgbeVDIBbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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