Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634114b099ab9b0cbf17af4a9dd894ecba0944308bf38dddb81041cda4c1aada' 
  AND token = 'Vjj0caDqNY0dZpBHL5qgSJMAgSGfPfPVr38t6gW6eQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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