Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6de2b793a192aac5630ecfa51067bb73e8ce79768150409d8fd3caf61a771c8' 
  AND token = 'dN/aVKzqeQ6rHrX0igGmAAkoHEiAxDF82p5ZvEaQOkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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