Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c6b55156ebfc6d7edb9ba4a8b8ab70c002614f25a0f24728a1620c21aa96b2' 
  AND token = '0l3jqQih3+UhV3wn5XhNrCKEb3d6/Cf1jZT/dTk2ViE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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