Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3608014b822079b4d3bdd962c900617f58636de0486de613c16bfffadb576e09' 
  AND token = 'u0fCZmbuyRARmetngTw/3BZOmo+T18wgyKWdxoPZE88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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