Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837e55d7c1f9280a1752a8ab751752de0c26d5b16b3ae54aeb596ca4a8752424' 
  AND token = 'I8/PTJMCWK4fCBvX41GseFTfLEVgTW0f+27nVh8efqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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