Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2358bd82e626a92976969210d2ddb57699928dde52cb4572d4854770872f6cf' 
  AND token = 'xHGUvCgD2UYsme+vg1lnAk2h2ItIYJDMCEBqewL9KPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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