Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3e96ba4b03610ad1a47a7876efb5576fb8b138515570160f1d811f46aec8b53b' 
  AND token = 'fstJK+9BAIyRUQwkhCIea4xDrFwsHNnbIiZHS6EfNk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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