Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1f882d56d9dd10d614cdad85336016376be6310c6753d2e07546723771a4aa' 
  AND token = 'rwkjfsgmNFfYDF3ZJshf+VdipYYI6qjIxNpERKcl5Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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