Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a8f59b513c46804b4c3ead9c1c5ced36de6f5e8e3355c5bd2e171534ec7dcfd' 
  AND token = 'sU43KGNQzjcCn3yO/bl5Fg6MpI2IOX7y7VmB1MeA5FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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