Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0028d78cc3850f68c28edff01d1fcb7c7d9fe8b688e40a66af62129857adad42' 
  AND token = 'nY53uUz6RVMIQ5qoxZMDRjEOk0w+7Z5HF6AjNMoXU80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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