Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f23b0bf7678bf4fe76abb57a013187126bd395812a2d8a8e9b5d0b176db22c' 
  AND token = 'dL6QUjvW/sXYnHgqE4Wn9zWtrac88EM71/02+KO1iCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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