Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7538a78b1910fe1aa3ab26b84ec30a9528c87f0c400d93960fd3e630c5ac37ec' 
  AND token = '8I1A0YEPvhw6b95hi2LSLz3mR6CqanMkMuEDfHB6eU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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