Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'effec7a5c541145e7d4b19720a74d545994000413172d2f1f434777fdb8f48ea' 
  AND token = '58UpwbO9nR2SeinMxxCt5icHG+NGd5UPNgxo2mwOeaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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