Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc49bbbe3738d78aa769dd727b24c1c88b29e173c0ded0e9033dc12f762205e9' 
  AND token = '4+KaZNLE/RF6tc71FZX2imgr/fuc+WE3YPzyNO1IZhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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