Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '138fe4cf5d6d0db2a44132fc6caa6b7b602a49b0a94b0ffc2b81411398ab91da' 
  AND token = '3/exacWj0XUwBOafzFU6prXpq9EqdG0irsqISj9nF84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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