Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9397a8bf369464ec19d0c4ec7cc04dc1dd498ee804eca333c232e38ce8a20f86' 
  AND token = 'mpNTollgsItdr+pM8zMZA4IWdphopv+GFU587RrhCHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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