Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3281072d047375d963f818677ec66aab1c7d712b5f9b7c22ce3c85b5f7d8ce02' 
  AND token = 'Td5g6SQSPAB3tkd7zA7w2B8R1N/Hn1ps5YFdzNqT5bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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