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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8565029aaa14921c90ff5cde9627ecf7a6a2724a920c09b66f86d3f588f5c76d' 
  AND token = 'eDvybvyXGo5WvwNe4Ydv9WiOBupGMqLHQitb5kR7kfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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