Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd64556426479329b23db8d0b98fe07ae4e74fad19de5bb7e2d6b90ba0c7287ac' 
  AND token = 'H3oup1GlwA8co4bCFrC9bkqh4gK+n6ohSmR7n9nDF1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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