Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85dbf0761b54ce29562b5600d03e3c5228289321808663f50421c9fdb4eea7de' 
  AND token = '+ow/qp+xbyzvi3vWnqaksJ/T2FsF9DVih24/4ucfVqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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