Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ff7f9c684f008ef1244aadb7255670e8ebef08d35441fdf2493323f1dd8fd7' 
  AND token = 'sVxoaUbizedsUsThGz/j0N0VzR7TfTM5uubT1b+ErjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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