Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b609b4b04d07958b16650dcac2f64c86364203b6472e350a7ee3acc0d3fc52ad' 
  AND token = '9bbWCutu22Y5F+1Yzu9I6v+Avaz1gFo3QAIgOohgXQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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