Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1732c31753e9bf8e06f6cb1bc1ea332149f1f0e99f29f8ccdf5be84021d913f8' 
  AND token = 'ezq42eY0JhFZi/CaiBdj11OmrKVpoaVZUK1ZFttzc0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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