SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0aa46d2c6e86349be4541b1a06fe314bf2e90c37eb6b62dd8e48555257c4b655' 
  AND token = 'MAuKqG7VMr9fUV76HITU+zRVQpVzXo9QqFifqdPY/uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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