Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c13ef26357dde340b27b9f5de061c30b0885d5013625af7c996ca78e2b8ebb' 
  AND token = '4ccVGITUiElNP/4RVyD4WlZQDJRga9Csv8JzI238hSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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