Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15bcaf2e1a686b4d1ce7f306b87015666ad793ba240a69827bb375091fa3b1c4' 
  AND token = 'EJsdpi/pfPp/bkds2GBdnwnge3fC1eO/ftoGgEaknf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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