Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b35ffd561a2371ef247639fcdd46a9b19971b5ecb9c777714d3e85d35b2a487' 
  AND token = 'amscyMfHk95o3VTpcdGenO1Z8KjNc84BUgiEgQhiQQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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