Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4de0a8c322ef3af3e3a2b2444c3f5b79319c39f4b10eb858d4cc34016ad106' 
  AND token = 'lIrj7PfWf2EnFsdPoi14lgJMtZVUaCscwAGmJSpu/Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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