SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '36574d8207ee4db2b10a433354687dae7be3f0c6e46c32c3d4b75573914673e9' 
  AND token = '/gZ7ojm0ek3rePCMqwFvX6SYJEGIl5Fo+pCjOalhwfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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