Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd635c82461807547702a9f1cd50d82f5d1f6693d1baaf448bb0ee8542ea82a29' 
  AND token = 'vdWTQ+hAMOMd7B+ubpxDTJONaCfO8seS9ySz/g95SWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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