Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d6a4fbdc9210f28f0f52dd11aaa9ff0570db506ec2be5cde163035adabf3c5' 
  AND token = 'gqVxgnBoMeXBoYOGSvsU3WCXKLASxn0jzDbpbWg67Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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