Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42eefa00884e190c5639e64d2f18d260dde19496ae3d5885672c9925be743303' 
  AND token = 'UM8zOu0vdvPGsDGdSVkQp+DZ3SM+mIUHj9vWn9nHeKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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