Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b324cb417b920795449a4773768e34cce6bf6aeeb02a7ffd5e8ed25651cf95' 
  AND token = '6fqOtX2pFIuw+5hMPorDwuRwk1pRHxROQ0MzPoQYmHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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