SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bb4fd71394e6894d9e8b181f42da7876e57fbdb0e1909a060fdc608567293683' 
  AND token = 'EOyKCdSkmM4QhHMawGeL6J0Ov3cMOj6LW+sK3NHxqU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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