Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d36a76d04bd8fd3542514f0ed9231ad587a6a20c4dcf1fd1f058c06dcdede1a' 
  AND token = 'wFz+WxLkqaNlFws9Fd8Y+khGcJvhVar4hqMMjXQNBPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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