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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd5ea77af7c6ee800ffa846e72f1258b181920e9984adb633db2234ff7ffcd2ff' 
  AND token = 'd2Gu+WoY9f0R9V4y4bKc2zfUisXQU0148BcPclFyYZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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