Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666c599e06820dd75669974695ba738d610beb6872f81597379920e371a5c0d4' 
  AND token = '+294yS2dDPsRA5gkSZf4MJsFOjDJjKMv+Qnq0NhKP/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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