Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca250b252d7a5d9a1d801af9ec8d82fb826c7b52cea4d08fc7317a5c8f3bb5f5' 
  AND token = 'lz223IGa2RlofSA0JbdC56E2hGdbwi8RsKoXwWuHTZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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