Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9f5df012497e7e65d9ad40e6481556f1c0b59f7bd23e579b5b478e99ca8a43' 
  AND token = 'oUY+thffQ1C6hobjh6eow5yk6eCvVLYut2OaEkLFpXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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