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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5963c87f115039fa8ade168553a8a35a6f717572b67fb1b7b7398841943a83ff' 
  AND token = 'gHLtld+sH0AjcFlsdW1Bj7PfwGJ7tdtlRJKi3IBuQ+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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