Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4ad86e3fd88ff7c873805efa2721cef71a6ba7d7b35452fe5de58a0cbabfce' 
  AND token = 'Zh1UcOTXXejPO5wzAA6ZSbhLmMav2uyff8lIoGd0VHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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