Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849a7f41ddf1870da51873d12ba6b77936c8fbef061ef2873a30dc742b105a24' 
  AND token = '0VG3MC0+1Cf47SUeWil1qKmOOrilJI6dDAQeMyh1bnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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