Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a6b9ca38acc54bb6b0e47ba7cc93122339cdc4fea4b714040616e4aad490ad' 
  AND token = 'bkWyT4f6iFX8zUlXqSmnOMjHsGmsGmdwOvp+rJYm+mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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