Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5f1982d11836991dbc7153e1817165a9860dc59cee22aabe58f17a38848f99d' 
  AND token = 'PqcDky3DaiI+Ph7vNIhYzHSbgdwa4eEDT/cz+VExG+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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