SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '409ea45567505a4085958cc5d33c0d4dae6658784d92ad2cb28b99e963857180' 
  AND token = '7fXiqo7OP637n/K5FmpTY1hvLEUuABUO9zlrsrU5FVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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