Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b4ff3aa683b47f141832d92fdb2b509ff2068b36267323ccc163d1cfb33617e' 
  AND token = 'dx7P3ybJzDdRqUROPZdIDMFJTEXyTNEVBAQ6UawewsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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