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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7f6036d9753a3a3b2a64b89a4ff2dc805aa71944c396fa7d6f6e8c4d7031a3db' 
  AND token = 'QbwVIUNNrEfC85dKlCBbX8twvyGcv1jBbAk2ThtCrbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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