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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '630ebd24bebcd5a7cdfd1216adb742f7c7a27bf851c7b60854d5ecd97f579012' 
  AND token = 'bywEBhTLNLWHdWaE94y6taVe92kcO2FIkWWThy3QaUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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