Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ac9e2fb12b2a42c58520f88f170815af04783e4f5077bbfad5f3b263515f57' 
  AND token = 'xchEtEUUE7M/xngAhF8M9ThNflXKOLzYbKDnwGwr+4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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