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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3f3492937b06422ce737ae390f7ea54c29080979c240102a390b1fb90d8a9d74' 
  AND token = 'pmT4GJ+f+vaCLIy4o7yx4QxRGz6/bp7A+WUpD62OUX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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