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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c9bc3811438bcf1ba291d87742bb8a2b825f7be9e7ea89042e21f606d77b119e' 
  AND token = 'TttK5zQsBSDOOq1M3AzRUU1L3d6b7+796DUGgxJNBKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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