Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59e15bf553fa2cbd0cc7c656dc707762078df139ee153f32a13ae303de615bab' 
  AND token = 'xI0198wYPCrOVol0Ke530jMyYeKCqPxrQc55kycvQ/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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