Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318c95e0bd747660a20a60bc429e3da40f4baa6af71af0f9f9292d8cdd69ea53' 
  AND token = 'W6CKMz8WexBZ0rLLtoc3LjBhG4QTVRz4Yt2Zf5q2M9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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