Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f1481fc92eb2871dc05c5e8e88a7f4716da4e9457c8c361ba61d676116b4af1e' 
  AND token = 'LcLsx+B3rg9XdXzLWV7aTR3Heo+UK87Iov4FptU5mrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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