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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a40315f03f601cfd6cb8e2b2abd6824d2642cdc6aae8c69f78ca010216bbff8c' 
  AND token = 'Sfuzf0sKZAv/M6KL8joSMSDi/yZBHb99r81KX1KZMHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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