Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e250d2c61f0f91688ca2abf69a7322424de585e22de49799788ecf714e8bd664' 
  AND token = 'ngaan4/Qs9OMGSDUUzSsELwLED67Zg9MFBWo4XyhAzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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