Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac8495843877c4935a4824a450831f1ca1649acee53ad625c0d5472d3a668a4' 
  AND token = 'EFSbceClKvnO2ZwObNOLWFIF7aHh0eM0PBV8xx1c4vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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