Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e4836964f240f7b044f5a4943c9f51eb28e835ec9ae8304288ee3d9a5428ae' 
  AND token = 'JW0cJzGDF0QiKzx0catVWzdV0MZjrbTLiLwk1uBxCk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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