Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df618fbc1cf412cf84a83c89aeb29577059d0348b041ed79431902adf97ecf9' 
  AND token = 'DRBXpMeoGes0YsPa/MzsDJG2hrCcFKnqRSffqHRb2Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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