Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e15dff02ff0c0ed85b9a80e367bb3414941e9e28e1db7c5ffb5acb40ab4b2a' 
  AND token = '+P3acSF/q8FgRxnwXrqw3Gx7U9GUp/zJEx4oPV9ieFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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