Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8b33385ce157083b60afd1740307cd196890aba3f086dbff86ed928e7373a267' 
  AND token = 'b19hFOb28SA3RsNcjdYdhE+LMFhRn8T8V6YCAl+s8qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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