Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40005f7e0faaedaaf53264b106666dc05d998e24c560f050fbc366857e3fb35' 
  AND token = '5kbUaTiZXpCYI3g01xQeRv5IiuXzb4CAX455Hb9txpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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