Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b65bf4d318af7c2d68bba83dc6cf6688202f119bdb413167977e5f97b7bbc0c' 
  AND token = 'Qwmogy8AEjAiw1SOcArNwIUsBZ3LEg101G/as4PhZTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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