Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f7eeec241f26b0ef4ef9276726fc433b0da159f4d5541e164698dbc871bad2' 
  AND token = 'LiOmwp38tJbPhs2R0ULKQ0vdX4pKc+0TcjJdefIo3zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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