Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ddc737dc29e68894940c6b0bb41d51c4a999ca20e43e797ee25df11601b8e0' 
  AND token = 'd4o+BcuRVa+JngoQuyYS0AjCytyFxKBLzctYWJRs2BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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