Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b996f6f6da4c56ae6d787ec31956b49590515fc916bbf56e5313771a46ffce9b' 
  AND token = '6UOa3EAPfgatJcz9wJqHg6knjisrrMgvfdsHUHPVwY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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