Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '221d248572974e6248f12abcbcb31961c5f45dbf638a9d972e687bdcd3be45b3' 
  AND token = 'j6ZU1fNRnd8HbtTkrhNmlmTD3SdVTQKjLRO6Q5QGD/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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