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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dd9536a90ff0781fce3348472654604c90693a52f2ecb2ae900a429b1fc095c4' 
  AND token = 'VWRqTBTQ87mR9B1cWIf1X1WQa0T1hetf249ee3w4Zac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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