Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd0927bd658f99654369764e39b318305e03ecc6df8ce7b9a5f5338d6c71695a1' 
  AND token = 'lRk3FzkaPnlyhnI1QCuYLF2k/6l6C6aR33cHtKZ84VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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