Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6859ae6ceeacef5b4cd01ae7ae01f9ca7a36fbed1fc1a3660339dce1347740c3' 
  AND token = 'OBuLUyGMpkRzXHWEAKkcsbIL7wp9N2l6eUEgYY8vYH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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