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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7eb1cbb850b52e825bc12618bed8ae8959f72f4f6d42e3851e4b45289112b7e8' 
  AND token = 'KUYIlEpSxd5FgvaU46ayATnPSjAX6ROYvvtgLothZCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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