Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6c5572a2ef3955dfa356f37eb15060e75a88299b0ee986d76407c6d8c4791f' 
  AND token = 'wk/HGFrlnKS6eGu7RhOlgq0tMtkTj53hsujmGX9vV60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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