Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf4ba566ac7b0eaf72b366c3ca914eb6b3ae0560012fcfd37470d1c7afa09c8' 
  AND token = 'DvYVkCmLtxQhJexjTnVSsaeTSdS+ljlDgiE4RdU3MNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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