Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3639dbb325c9bbd9d9a38f8a04f50e43ca7c8cfc88245d9ba9bb2fb4185ddb6' 
  AND token = 'BZPta6xO+G8cfQ/ayAA0aGlxQDyGI4erILXmUuQDeks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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