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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9b93188746365cac42e46c8adb60596926275b54d6bc2ae678f9254e0daa0a08' 
  AND token = 'kkSWdlFrH2e3GTebHcS868yziBQZjSrqsOftkMynwn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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