Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9eed62d784796fa050001c60c6ac6875fa46cf4cb35c9744075bcf336738646' 
  AND token = '7MS7lJKpfd4xxihxtPf0LFW+wVmjJLBiBnOwcNVybIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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