Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2743f14b46bb8065bf56552ff9628f1a00bed56e00a56d2aa7511efd5aa05a8' 
  AND token = 'AjvUcH9JQRTHJaxKLdJ8vZhsH/7dMGo9xd+b6NR+Usk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00234

JSON explain

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