Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02921e65b0893891c97e10baf19e457e7e8f7bbcf3a346e81a2f1b9e6940992' 
  AND token = 'tQBZEvUJqCeTEaSxjeR4BvoU6YvpxI9uJ12CJVzq8lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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