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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '784347f2f41ad7ab8aee2653d0fbacddc1020e8804f34936d6e9d9264ca738e4' 
  AND token = 'l8aiHUgMT+KuILvMwKAM5u6FYAeI0yjd6TgNzG7dVO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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