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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '65ae7dab45b3fb343d46ec3004b75fb9d9b35cda5d651f81514dcae8be9e76f5' 
  AND token = 'qRRkhzYFlfmTAzdW+52Mw9cB9rzOFC+t+JSELUwk0Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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