Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31379629172dfde491dc3da88c08a385ae4ad2a41f0e502e5af1d54da795c421' 
  AND token = 'HDugHEDKAglb1/yHGKyWtiPuLvhgbs7geelu8a4T424=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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