Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc57c365a4bfe7c37b50d12718bccc26cacf18f1d4f0ff4422ba9bd164f09fa8' 
  AND token = 'o7vVv7pwWtNYarmO5qDbARC7CIGgEF+hJTm0WmipyEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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