Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e54d23bd0a9e34e79d3a846a3019f6cd2a38f83f7b5ad0806592b0cdc2c65808' 
  AND token = 'KSimfl5s9xHkbkduRlJpduiFwZ6FXQJyeDWNhSgTiGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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