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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ba72d138b2552362a3137ed1daedbe5c577e5b652023515e2575adb4e225d12' 
  AND token = '/WjmEiUijPayUPlLFikbTAyPSBU7NQVGdcUEC7YJd2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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