Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd93f74df2ae7f0d4f12222249d036beb14a838cef180c81503a34785b08d8a' 
  AND token = '7u+qyvcG97DdrArgbZMXTOAVBTuOw/AOcaR/c3R/1j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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