Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7538e61179798139009d5707ba8477169d6299356ee9d7d6611f7276186f248' 
  AND token = 'V7o/x48gPtw6f5AFdaNZ+sJxwyrmyW4QGhxB4B3RPns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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