Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a492bf6bbf834b1b2a966bedc9fc3fb9641eee08bb76b96a06e794bec9c736e' 
  AND token = 'fzUtEfD6tdHZUxbBfMYyiy76ynZSSbTSrMvhwHoi0BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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