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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '558f3bcffee2e78289a6449d486cacd1e84b54c17dc73178b31c6af69539cee7' 
  AND token = '3UyTmZNVcUPE4jXeSaSm3gu4vyUpGgymwcji4yDuUiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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