Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3993dc1336b6b4ebea2e2b725e9ef8d0c7340064e05261327d39584cd02c7898' 
  AND token = 'VSTrpi/gr9IXOe+P1rsu0fx2muTzU7oRJHlpf/dVC1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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