Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83cfe0ad5f52343a6e8b735c23c8861147abb5bb3c9863f8bb5c8a8447b75f98' 
  AND token = 'p1C2GumnEDDqWwytyB51UNq++VDYa1mbNtpm0cR8yXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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