Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908d9a4fac42b507099d4e0ad5313873dde250aa1f958666dda910234bebd4ee' 
  AND token = 'osMHpDu6q9vvHM3hd2Go4AsumSUkit+xvCLlQnBYtuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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