Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87eb8e500682b33ca36fa71159d009651aa4e96cc3d5b2973b91de7d49346b4c' 
  AND token = 'aJ1za7X7NPrGrYogHshtc63ZeUWcV5nRvVVI4maX6AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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