Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db0ffee83ab7b3b46486ebce6935a4290d08cc4c1204eb1a67d0dadf9c220fe' 
  AND token = '99aS7dVlmdLn/VyWVYOhite1TSEQdPmwtjF6ZLCZDGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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