Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f2c7a72e1c14364e4226967c68049cfafcf9a593173f1c5d272b01d1c1bb87' 
  AND token = 'i7YH2jkdXp7wOSwLUQWtIhIQb6v1W+xlSYTdXaLbnzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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