Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '01e4c775fb42eb04435b265b03e535e070ac148c1f7061bcbd7b0ced70e45fda' 
  AND token = 'sdbOFiehetcAgasibx6LHHwzXpMZuMzycKag1xk0us8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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