Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20fb7801c89b3ed2159fc76e614c45f61c1abd75b87599b65e886a6cd048c52' 
  AND token = '3lNQsm1KxgxnCsiJSFuAirnv2lm8srZgdRR+8oX8M9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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