Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a77c972ddabee6607bfe64b86fde023e0e3dd5c1fed5ad8ad1625fe9389f9b' 
  AND token = '/0krbzZpYYaPa7WUUWGUQ9saGk96zozBqgY7I/a70Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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