Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ba318bf2a9c1b01f832a2cd1d4fc438269a1552a74ee8bb7290047a764d296' 
  AND token = 'CnLY43oHC9X248LYpieiqfiP39+Qbg587AqEfctvIfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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