Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ea6aaea862de5e1b6c30b1d52cd14874a0fde2e5589533ea5c18860eb084fa' 
  AND token = 'JDV1IQfN67y9FScDDHzClJ7oDWKKYf2PgiFDZ6Zxg84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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