Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1792a6d8d4b56bd3b1dfdcc86f056b761fd618cef6a61e54cb0148d2cff035' 
  AND token = 'Z7pt7XmSjjmf+c1IZwoesjTp4Wv95dYFcOxTb2TpvbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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