Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a3d2c21e26a1024dade1a2af4c98f1cc9d29fe70f8525410381aadd64e1b47' 
  AND token = 'vejwazDaEspL3YYPLwY3QwxXNUHx/kYqT43Zv2vseok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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