Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab790c0906369b050456141feee8ff6f56bfb4aee4908cddb92a18248c3e22b' 
  AND token = '9L9tEeLdbSmIy3dyKgPYyAvyV7L/BGxeUPi4WXEB2c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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