Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206d20a87f1af4572e16bf1b1569ece929d69eb04f518e48f649278715aab26c' 
  AND token = '1yKcf94Lub7qcbyGjfuHWLDO1Y3ITseqqjTHwmTewXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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