Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294abe88b8dd3c096af8150380780a64a08b55ff5f4a758a33c305c81ed47d03' 
  AND token = 'hZf9bXEC6DEyS7NmlfAVjZLEDOWCoU5ZtYFV89J+mvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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