Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '95a9589a3435f4a12f37b05a0fdeb1c4d6f8959cc5c573142aa42dc9059c42f1' 
  AND token = '2pTC6vqr3RYUQ2pSTiS1FIwIEkUBtGnLfx5PGePdcf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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