Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e4661d7390bfb0b9e4c63feadb7ebf2b344cf6bca764d2becbc5bcc6483c8a' 
  AND token = 'AJ8yhYFaLwLAwS/RVWL3hHHI80CV9b6QblA16TE3xPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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