Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e15508f31be88b84752caeca304f4b4c8298fc727ead859b556a4ee9b2e77b6' 
  AND token = 'tTSEf9TIwirMzL+WsMh9ijBek8B6Oq4T8WloRoYXmvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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