Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '67e6a4487f9287e947a32ed0f363c65d4c6c7a7091e8242ef735d9662ad2ebb5' 
  AND token = 'XuBJE+RAN0dnJYnp1OV878J+02wn9YhBleyYv9SIEEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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