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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cbf8b0626bfefa5b45eef87413f4fbbb6c656e3212178c77b604c63a9f134a95' 
  AND token = '+qbCjExqdSgeEmMrweuaO4XVDT9TYnYTqhZA58LFS7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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