Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f909ace2c267de5ea474d85e61b15b751c14b7a7780af8c5d6d79b2da81db0e8' 
  AND token = 'yCEXUrLpX3nDcTQT4/cJDJKhKFkznvztusJTtgostfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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