Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405d02f8a5d1fd8d03b755f2eeb581f19ce565d5b78c55a88be9ff20c76cd268' 
  AND token = 'XfxHcoFBlu3gkI+8Cgq0Vbsn6nuNjDZiBzS5gxnBSRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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