Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b50a93049e5913eb5dab73b0cacb6f1daecb2a23ecd576ef1f62b9f169754b4' 
  AND token = 'e3+IcYhE9+Y1g8Tx9ZesB9XMSIAMOlMgYsToRjvP9dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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