Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f4d24dbaae26fb7c7398a87d6cf1baffcfa0ea5abd7da619c88c66dd58b8bd' 
  AND token = 'lNO6R0d6/m3yxsxFoXSrgEnLBFrsvYuEWkprTHH/M3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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