Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9e4ec44380faefa524f2147c4b78b95bb971f6d7441f80e54ef02c4b306d7cdd' 
  AND token = 'sZrClOhd7CKZeFmDoRs/p2SMHbp8pJRR4Jlnf/dFXWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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