Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056f10b3927984340aeaa122330b38fe9d796b8bcb4bc12f6edeaf7f36546f12' 
  AND token = 'rO/I4xAaofRcXo+Pr3ShdNgD2EtKVC7dIkJZNqyVFtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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